F0070 fault in WEG CFW701 Drive indicates Overcurrent or Short-circuit. This means a massive current spike was detected, usually caused by a physical short in the motor phases or braking circuit.
Cause:
- Short-circuit between two motor phases.
- Short-circuit between the dynamic braking resistor connection cables.
- Shorted IGBT modules.
Remedy:
Inspect motor terminals and cables for short circuits. Check braking resistor wiring. Verify physical state of the output IGBT stages.
